Abstract
Abstract Seven novel triterpenoid acids and lactones with a 9β,19-cyclopropyl-1-en-3-one skeleton have been isolated from the leaves of Combretum erythrophyllum. Spectral analysis has shown these compounds to be either hydrated or dehydrated in ring C and to have unsaturated γ- or δ-lactones in their side-chains. Erythrophyllic acid, the representative compound of this series, has been identified as 3-oxo-cycloart-1,11,24-trien-21-oic acid. The most abundant compound, 3-oxo-cycloart-1,11,24-trien-23,21-olide, yielded two hydrogenolysis products when hydrogenated using Adams catalyst.
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